Hi Wolfgang, thank you for the answer (There is much to know !). I would also have this:

I First chapter Activity 1.1 Second section 1.2 Third section

\setupheadnumber[section][0] Fabrice 2016-07-13 18:20 GMT+02:00 Wolfgang Schuster :

Fabrice Couvreur 13. Juli 2016 um 17:09 Hello, I wish that in the table of contents and only one, the number of chapters are I, II, III, IV ...

When you change a different conversion for the chapter numbers only in the ToC use this:

\defineconversionset[chapterconversion][n,R][n]

\setuplist [chapter] [numberconversionset=chapterconversion]

but when you want it in the entire document use this:

\defineconversionset[chapterconversion][n,R][n]

\setuphead [chapter] [sectionconversionset=chapterconversion]

Wolfgang

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